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Adaptive evaluation method for under-balanced drilling
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An underbalanced drilling and adaptable technology, applied in earth-moving drilling, wellbore/well components, measurement, etc., can solve the problems of gas drilling failure to consider rock surface glaze, failure to conduct systematic and comprehensive analysis, etc., to achieve theoretical The effect of great significance and application value
Active Publication Date: 2011-09-14
BC P INC CHINA NAT PETROLEUM CORP +1
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[0012] ①The current numerical simulation is mainly to analyze certain types of reservoir damage unilaterally, for example, the liquid phase trap model and the solid phase intrusion model have been established separately, but systematic and comprehensive analysis has not been carried out;
[0013] (2) Some numerical simulations have carried out a relatively comprehensive analysis of reservoir damage, but few factors have been considered. For example, gas drilling failed to consider rock surface glazing, and the liquid phase trap model did not truly reflect the impact of drilling fluid on the fracture network. level of influence, etc.;
[0014] ③The mathematical model currently established fails to truly describe the actual situation in the mine
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Embodiment 1
[0063] The invention discloses an underbalanced drilling adaptability evaluation method, which comprises the following steps:
[0070] Based on the logging data of adjacent wells and the existing mathematical model of wellbore stability, the collapse pressure, formation pressure and fracture pressure are determined, and the adaptability of various drilling methods is analyzed;
[0072] According to different geological characteristics, the existing theoretical mathematical model of liquid capillary self-absorption, the existing mathematical model of solid phase invasion reservoir depth, the existing stress-sensitive well test model, the existing rock surface glazing model and the ...
Embodiment 2
[0076] As the best implementation mode of the present invention, the whole analysis process is as follows figure 1 shown.
[0079] 2) Drilling design data, including drilling fluid performance parameters, including density, viscosity, composition and content, particle size and range;
[0080] 3) Drilling parameters, including vertical pressure, casing pressure, displacement, well depth, well diameter, drilling time, tripping time, tripping time and other time;
[0081] 4) Geological data of adjacent wells, including the orientation, size and quantity of fractures, the distribution of pores, permeability and saturation along the well depth, the distribution of salinity, mineral composition and content, geothermal gradient, and the content of various components of formation gas.
[0082] 2. We...
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Abstract
The invention discloses an adaptive evaluation method for under-balanced drilling and relates to an evaluation method which is suitable for structures of different areas and is used for selecting different under-balanced drilling modes. The adaptive evaluation method comprises the following steps of: a. data preparation; b. stability prediction of well wall; c. adaptive quantitative evaluation of a storage layer; and d. economical evaluation. According to the adaptive evaluation method, the problem that the under-balanced drilling mode is determined by a qualitative method is thoroughly solved; a large amount of indoor experiments are avoided; and the economic effects obtained by different drilling modes can be predicted.
Description
technical field [0001] The invention relates to an evaluation method of how to select different underbalanced drillingmodes adapted to different regional structures. Background technique [0002] With the continuous development of drilling technology, three drilling technologies have been formed, including conventional drilling, underbalanced drilling and managed pressure drilling. Among them, underbalanced drilling technology can be divided into gas drilling and liquid phase underbalanced drilling according to the type of circulating medium. In liquid phase underbalanced drilling, there are drilling media such as water-based drilling fluid, oil-based drilling fluid, imitation oil-based drilling fluid and glass microbead drilling fluid. [0003] Underbalanced drilling technology has the advantages of timely discovery, protection of reservoirs, improvement of ROP and solution to drilling complexity, and has become the key object of drilling design. Therefore, according to t...
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